Chirpstack Gateway OS on RPi 4: No HDMI, no start

I am running the Chirpstack v3.3.3 on a raspberry pi 4. When installing and configuring I always have a monitor connected to the RPi and it Chirpstack works fine.

  • When removing the HDMI cable from the Rpi and restarting it does not boot at all

  • Solution: configure the config.txt on the SD card when accessing the SD card from another PC (not via the RPi)

    /## hdmi_force_hotplug
    /## Pretends HDMI hotplug signal is asserted so it appears a HDMI display
    /## is attached
    /##
    /## Value Description
    /## -------------------------------------------------------------------------
    /## 0 Disabled (Default)
    /## 1 Use HDMI mode even if no HDMI monitor is detected
    /##
    hdmi_force_hotplug=1

  • Booting the RPi now works without monitor

However it seems that after a time (15 minutes or so) the chirpstack does not react (MQTT no longer received). With monitor it all worked very smooth.

Any idea what the cause could be?? (sleep timer??)